Új FTIR mérési eredmények az Avas–Gutin mészalkáli vulkáni kőzeteiből: poszterupciós hatások nyomai a fenokristályok szerkezeti hidroxil-tartalmában: New FTIR data from the Oaş–Gutâi Mts. and post eruption effects on the water content of phenocrysts

We studied calc-alkaline volcanic rocks from the Oaş-Gutâi Mts..  The major goal of our research was the determination of ‘water’ content in the phenocrysts of the nominally anhydous minerals (NAMs) and also to uncover the possible post eruptive changes in the structural hydroxyl content of NAMs.  The selected volcanic rocks were studied by petrography, EMPA, LA-ICP-MS, ICP-OES, ICP-MS and FTIR. Our assumption is that by studying the FTIR spectra of clinopyroxenes, the structural hydroxyl content of the NAMs changed in comparisons to the magmatic equilibrium

Application of attenuated total reflectance Fourier transform infrared spectroscopy in the mineralogical study of a landslide area, Hungary

This study demonstrates that the unpolarized attenuated total reflectance Fourier transform infrared spectroscopy (ATR FTIR) is a practical and quick tool to distinguish different types of sediments in landslide-affected areas, and potentially other types of physical environments too. Identification and quantification of minerals by ATR FTIR is implemented on a set of powdered natural sediments from a loess landslide (Kulcs, Hungary). A protocol including sample preparation, analytical conditions and evaluation of sediment ATR spectra is outlined in order to identify and estimate major minerals in sediments. The comparison of the defined FTIR parameters against qualitative and quantitative results of X-ray diffraction and thermal analysis was used to validate the use of ATR FTIR spectroscopy for the considered sediments. The infrared band areas and their ratios (water/carbonates; silicates/carbonates; kaolinite) appear to be the most sensitive parameters to identify strongly weathered sediments such as paleosols and red clays which most likely facilitate sliding and could form sliding zones. The effect of grain size and orientation of anisotropic minerals on the wave number and intensity of some major absorption bands is also discussed

Metamorphic and deformation history of the Mecsekalja Zone around the Szentlőrinc-1 well using individual quartz grains from drilling chips

The Mecsekalja Zone is a strike-slip fault zone that plays an essential role in the structural framework of South Transdanubia. The metamorphic and deformation history of the crystalline basement of the Mecsekalja Zone has been determined thus far based exclusively on a few surface outcrops and near-surface samples. The Szentlőrinc-1 (Sztl-1) well penetrated the shear zone at a depth of approximately 2 km and brought drilling chips from a 220-m-long section of the basement to the surface. The aim of this study is to reconstruct the metamorphic and deformation history of the Mecsekalja Zone along the Sztl-1 well using these tiny samples. These drilling chips consist of single mineral and rock pieces that are dominated by quartz grains. This study concentrates on the detailed analysis of quartz grains utilizing the physical conditions of metamorphic evolution as well as ductile and brittle deformation to determine the chemical composition and rheology of quartz. The evolution of the studied area can be determined by evaluating analytical data measured by Raman spectroscopy, LA-ICP-MS, and FTIR spectroscopy. These data suggest that the maximum temperature of the early regional metamorphism was 500–575 °C, the temperature of the subsequent ductile deformation was below 500 °C including recrystallization occurred between 400 and 475 °C. During the structural evolution of the study area, two independent, single deformation events occurred. The earlier ductile deformation event was followed by a brittle event through the reactivation of the former ductile shear zone. Our model is in accordance with previous results concerning the evolution of the Mecsekalja Zone, thus, the shear zone, with an identical evolution, can be extended toward the southwest at least to the Sztl-1 well

A new ladybird spider from Hungary (Araneae, Eresidae)

According to the most recent taxonomic literature, three species of the genus Eresus are known in Central Europe, E. kollari, E. sandaliatus and E. moravicus. We recognized a fourth distinctive species from Hungary, which is described as Eresus hermani sp. n. Eresus hermani has an early spring copulation period, females have a light grey (grizzled) cephalothorax due to a heavy cover of lightly colored setae, and an epigyne with large flat areas posterior to the epigynal pit, while males are distinguished by a broad and blunt terminal tooth of the conductor. An updated and modified comparative table of Rezac et al. (2008) to include all four Central European Eresus species, and a simple key to the species group's species are given. Habitus, epigyne, vulva and conductor of E. kollari, E. moravicus and E. sandaliatus are also illustrated. An annotated list of papers illustrating E. hermani due to misidentifications is presented

A new Loureedia species on overgrazed former cork oak forest in Morocco (Araneae: Eresidae)

In this paper a new velvet spider species from Morocco is described from an overgrazed former cork oak [Quercus suber (Linné 1753)] forest. It is the second known species of the hitherto monotypic genus Loureedia. Loureedia maroccana sp. n. is distinguished from L. annulipes (Lucas, 1857) by the morphology of the conductor, the anteriorly widening cephalic region of the prosoma and opisthosoma decorated with a lobed, bright red marking on the dorsal side. Furthermore, three partial gene fragment sequences (histone 3, 28S ribosomal and cytochrome c oxidase) are also given, supporting the establishment of the new species